<!-- Fixed navbar -->
<nav class="navbar navbar-light bg-light fixed-top navbar-expand-sm">
    <div class="container">
        <a class="navbar-brand" target="_blank" data-dl-root="true" href="">Bootstrap4 中文文档</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarCollapse">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item" id="nav_getting_started">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="pages/getting_started.html">入门</a>
                </li>
                <li class="nav-item" id="nav_layout">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="pages/layout.html">布局</a>
                </li>
                <li class="nav-item" id="nav_content">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="pages/content.html">内容</a>
                </li>
                <li class="nav-item" id="nav_components">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="pages/components.html">组件</a>
                </li>
                <li class="nav-item" id="nav_utilities">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="pages/utilities.html">工具</a>
                </li>
                <li class="nav-item" id="nav_extend">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="pages/extend.html">扩展</a>
                </li>
                <li class="nav-item" id="nav_examples">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="examples.html">模板</a>
                </li>
                <li class="nav-item" id="nav_about">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="changelog.html">更新日志</a>
                </li>
                <li class="nav-item" id="nav_about">
                    <a class="nav-link" target="_blank" data-dl-root="true" href="about.html">关于本站</a>
                </li>
            </ul>
        </div>  
    </div>
</nav>
<div id="header"></div>